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ChuwiHI13 and the Keyu battery charger

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szucsi|Post time:2-9-2018 19:02:00 View:3230|Reply:79

szucsi| Post time 12-28-2017 10:24:26 | Show all posts
Edited by szucsi at 12-28-2017 10:29

Indeed, it is a bit more complicated, but so simplifying this formula is correct.
Charging current is influenced by several factors. 1. There is a built-in charge controller in the battery. 2. Hi13 has a built-in USB Pd controller (Etrontech EJ898A)
The charging current is always under control. This also depends on the battery charge level.
However, regardless of this, you should never rely on the lower filling level.
When selecting a charger, the maximum load should always be used.
The current is influenced by many factors.
And with the Keyu charger, it's not the q problem that it's low in performance. Nobody says that. The problem is that it can not communicate with the USB PD controller. This charger is not integrated with an intelligent control chip. The problem is that it will still charge 12 volts when the USB connector is damaged. And even then 12 Volts gives a voltage if someone accidentally connects to a smaller device (eg 5V). It is flammable and is not allowed.
USB-C connector is eghy standard connector type. This is not allowed to be present with 12V voltage, without control.
You do not need a laboratory to find out this is a $ 1 charger. And you do not need a laboratory to figure out what's going to happen when the USB-C plug is damaged. There is evidence for this. In my repair shop, there are currently 4 pcs HI13 Tablet Pc. All 4 with the same mistake. The usb PD controller chip is burned like a volcano. The USB-C connector on the Keyu Charger loosens. This is causing the shortcut. This replaces motherboard. The motherboard costs about $ 120. That's a big pity with a $ 1 battery charger. Anyone who accepts good advice will survive this motherboard replacement. Anyone who does not, will soon think about it.
****** Here, I wish everyone, Happy New Year******
Szucsi
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jerry| Post time 1-16-2018 14:03:29 | Show all posts
szucsi replied at 12-28-2017 10:24
Indeed, it is a bit more complicated, but so simplifying this formula is correct.
Charging current i ...

Szucsi, can we assume that we can avoid any potential damage to the motherboard by buying high quality USB-C plug and soldering it to Keyu charger? (or by using USB-C OTG with USB-A plug connected with charger). Would it still be dangerous to the Hi13 because of the lack of communication with the control chip?
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szucsi| Post time 1-17-2018 16:08:34 | Show all posts
Edited by szucsi at 1-17-2018 16:12

Dear Jerry Of course, it solves the problem for a while. The ultimate safe solution is to purchase a 12-volt usb pd compatible charger. I know Chuwi is willing to replace these chargers with another type. To do so, you need to get in touch with after sales. For the new Hi13 tablets, they already have a better charger.
Szucsi
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robsm1th| Post time 1-19-2018 10:16:43 | Show all posts
szucsi is right the newer models come with a newer charger but if you want a spare this works ....

https://www.amazon.co.uk/Charger ... eywords=Aukey+usb+c
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jerry| Post time 1-19-2018 12:50:56 | Show all posts
Thank you for your help.
I ordered AUKEY PA-Y10 today. Some of the users still had problems with the one you mentioned, Robsm1th. That's why I decided to try the 46W model.
It's obviously more expensive - including shipping I had to pay around $50 for it so almost half of the motherboard replacement (according do Szucsi). Considering this fact I had to be more confident that the charger will be compatible. Hope this will pay off...
BTW. I got what you guys seem to refer to as "rev.2" of Hi13 (Hynix drive).
I'll give you the feedback if the charger works as soon as I get it.
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MemberChuwi| Post time 1-19-2018 13:59:07 | Show all posts
I think the 46W model is more versatile as it has an additional standard 5V USB A charging port. This made me accept the higher price tag of about 40€
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szucsi| Post time 1-22-2018 14:23:59 | Show all posts
Edited by szucsi at 1-23-2018 14:59

So Hi 13 is a good tablet, deserves a really good charger.
Since I'm fixing Chuwi tablets, I know all the Tablet PCs. All in all, this is the best. On the motherboard, it seems that this is well planned.The only construction error is that you should not run the 12 volt charge on a usb-c socket. It would be more convenient to use a conventional jack.
Szucsi
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MemberChuwi| Post time 1-28-2018 20:55:02 | Show all posts
Edited by MemberChuwi at 1-28-2018 20:56

First time I note someone requests a traditional charging port. I totally agree that a simpler port would be more rugged. Most people think this is old fashion opinion... as I would prefer a simple plug too. If you are familiar with repair, do you think such a 12V port could be modded easily? Are there any points inside to solder simple supply lines?

However, I don't think 12V by itself is a Problem for the USB C plug. Probably the current of 2+A isn't great but not a severe issue either. Imho the miniaturization of USB C is the main issue. You need quality plugs and sockets to get a decent experience. Mediocre quality or less is simply dangerous. Crazy is ad well how thick good cables have to be - compared to the plug. The proportion simply isn't proper.

From functional point of view USB C introduces more headache than simplification. Maybe it's nice in a docking situation to just use one cable. But if you want to connect a charger while needing the port for data transfef it becomes a crazy and expensive dongle business.
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szucsi| Post time 2-7-2018 10:24:41 | Show all posts
Edited by szucsi at 2-7-2018 10:27

Now a modified motherboard came to me at the workshop. Unfortunately, charging is also via usb-c connector. On this motherboard, charging control was also transformed. A new type of usb PD controller was made. This is Etrontech and another type. The point is that it was also burnt out like a volcano. In addition, on a new basis, all connector positions have changed (battery connector, LCD connector etc). So if you need to replace a base, instead of the present one, it will not be compatible. The point is that on the renewed motherboard, charging remains on the USB-C port. So unnecessary efforts were made by the users. Manufacturers follow the original path.Note: The wheel, an old invention, is still good. A separate charging port, similar to this.
Szucsi
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szucsi| Post time 2-9-2018 19:02:00 | Show all posts
Edited by szucsi at 2-9-2018 19:04
robsm1th válaszolta 2018/01/19 10:16
Szűcsi közvetlenül az újabb modellek jönnek újabb töltőt, de ha azt szeretnénk, egy tartalék működik ....

...
Inateck UCC1001BK 45W USB C twallcharger 25$I bought it on amazon, an Inateck Pd compatibilis charger. It works great. it is not expensive either.https://www.amazon.com/Inateck-U ... tendo / dp / B0739MH1M2
Szucsi
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